采煤沉陷影响下的框架桥附加内力变化规律研究

Study on the variation law of the additional inner force of frame bridge due to mining subsidence

地下煤炭资源采出后,会发生剧烈的地表移动,主要体现在地表沉降、水平移动、倾斜变形、曲率变形等。钢筋混凝土框架桥具有整体性好、适应地表变形能力强等特点,是采煤沉陷区桥涵工程的主要结构形式之一。本文采用相似模型试验技术,根据相似准则确定了模型尺寸和试验方案;通过室内模型试验,研究了在不均匀沉降条件下,箱涵基底附加应力、箱体上表面的竖向位移、箱体侧墙挤压附加应力,为采煤沉陷区框架桥科学设计提供了理论依据。

The large ground movement which is indicated by the ground subsidence,horizontal movement,inclination deformation and curvature deformation will occur after underground coal mining.The reinforced concrete frame has the characters of good integrality and strong ability of adapting ground deformation,which is one of the good structure forms used in coal mining subsidence area.Based on similar model experiments technology,the model size and experiment schemes are decided.The additional pressure at foundation bottom of the box,vertical displacement of the box upper surface,and additional pressure at the side wall are studied with different subsidence.The research results provide the theoretical foundation for scientific design of the frame bridge in coal mining subsidence area.